US7188561B1 - Adjustable firearm trigger mechanism and method of adjustment - Google Patents
Adjustable firearm trigger mechanism and method of adjustment Download PDFInfo
- Publication number
- US7188561B1 US7188561B1 US11/296,401 US29640105A US7188561B1 US 7188561 B1 US7188561 B1 US 7188561B1 US 29640105 A US29640105 A US 29640105A US 7188561 B1 US7188561 B1 US 7188561B1
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- United States
- Prior art keywords
- trigger
- firing pin
- bar
- push rod
- sear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/16—Adjustable firing mechanisms; Trigger mechanisms with adjustable trigger pull
Definitions
- This invention relates to a trigger assembly for firearms which is easily adjustable for military, hunting, and competition shooting and which is both safe and efficient in operation.
- trigger mechanisms Over the past several centuries, a variety of trigger mechanisms have been devised for many different types of firearms and for different applications. Typically in military and hunting applications, trigger mechanisms are designed with emphasis on durability and reliability; consequently, such trigger mechanisms often have heavy trigger pull forces associated with firing the weapon. However, a heavy trigger pull forces degrades consistent accuracy and is particularly undesirable in competition shooting. Heavy trigger pull forces can result in instability of the firearm and also can fractionally delay discharge from the instant desired. It is necessary, of course, to have some trigger pull force to give the shooter feel and control of the firing process.
- trigger pull force is dependent upon type of firearm, application, and individual preference.
- An individual shooter might desire a medium to heavy trigger pull force when hunting, and a somewhat light trigger pull force for competition shooting. Further, a competition shooter might have a personal preference for a trigger pull force from two to twenty ounces.
- a striker or cocking piece is held in the cocked position by a sear, with the sear in turn supported by a trigger piece.
- the metal surface interface between the cocking piece and sear carries the main spring load.
- Typical adjustments to the trigger to lighten or vary the trigger pull force include adjusting the trigger spring or reducing to a minimum the mating surface area contact between the cocking piece and the sear.
- trigger pull force is the so-called “multiple-lever” approach.
- a third lever is interposed between the trigger piece and the sear to reduce the contact load carried by the trigger piece.
- the mating surface between the cocking piece and the sear carries the large (about 25 pounds) mainspring load, while the mating area between the cocking piece and third lever carries a substantially reduced load.
- a trigger assembly were devised which allowed for adjustment of trigger pull forces over a wide range to accommodate both hunting, military, and competition shooting. Further, it would be an advance if such a trigger assembly were adjustable to individual preference.
- the adjustable firearm trigger mechanism in accordance with the present invention generally solves the problems outlined above. That is, the trigger assembly hereof is easily adjustable over a wide range of trigger pull forces.
- the trigger assembly hereof is externally adjustable allowing for adjustments to the trigger operation without removal of the trigger assembly from the firearm.
- the trigger assembly hereof is particularly adaptable for use in a Mauser, bolt-action rifle, it being understood that the trigger assembly can be easily modified for use with other types of firearms.
- a Mauser bolt-action rifle includes a cocking piece or striker interconnected to the firing pin mechanism.
- the trigger assembly hereof includes a firing pin block bar, a pivotally trigger shoe, and a link mechanism interconnecting the trigger shoe and the firing pin block bar.
- the link mechanism includes a sear bar coupled to the trigger shoe for rotation upon pivotal movement of the trigger shoe, and a push rod slidably disposed in one of a plurality of user selectable push rod holes in the trigger housing between a first pivoting end of the sear bar and the firing pin block bar.
- a trigger pull adjustment assembly is disposed between a second pivoting end of the sear bar and the trigger housing includes a trigger pull adjustment screw mounted in a threaded passage of the trigger housing, and a sear bar return spring abutting the trigger pull adjustment screw and inserted in a portion of the threaded passage of the trigger housing.
- FIG. 1A is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a first configuration with the firing pin in a cocked position.
- FIG. 1B is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a first configuration with the firing pin in a discharged position.
- FIG. 2A is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a second configuration with the firing pin in a cocked position.
- FIG. 2B is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a second configuration with the firing pin in a discharged position.
- FIG. 3A is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a third configuration with the firing pin in a cocked position.
- FIG. 3B is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a third configuration with the firing pin in a discharged position.
- FIG. 4A is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a fourth configuration with the firing pin in a cocked position.
- FIG. 4B is side sectional view of an adjustable firearm trigger mechanism according to the present invention in a fourth configuration with the firing pin in a discharged position.
- the present invention presents a novel trigger assembly for firearms which is externally and also in turn only adjustable to change trigger pull forces and locked time for both hunting and competition shooting. Since all modern bolt action rifles are basically the 1898 Mauser type design, this trigger assembly can easily be adapted to work in almost all Mauser type bolt action firearms.
- the adjustable trigger of the present invention is an adaptation of the basic three lever design.
- the basic three lever design comprises a trigger shoe, a firing pin block bar and an interconnecting sear bar.
- the present invention modifies the interconnecting sear bar so that it can be adjusted to change the trigger pull force on the trigger shoe, and the lock time of the firing pin block bar.
- the lock time is typically the time it takes for the firing pin block bar to release the firing pin cocking piece after the trigger shoe has been pulled.
- FIG. 1A shows the adjustable trigger assembly of the present invention.
- Firing pin block bar 1 is pivotally attached to the trigger housing 5 via a forward action at trigger pin 15 .
- firing pin block bar 1 In a cocked position, firing pin block bar 1 abuts a rear action trigger pin 10 in an upwardly rotated position.
- a rear upper edge of firing pin the block bar 1 engages a corresponding section of firing pin cocking piece 13 attached to the rifle action bolt body of 14 .
- the firing pin block bar releasably retains the firing pin cocking piece ⁇ 3 from moving in a leftward direction to therefore strike the primer of the ammunition.
- a trigger shoe 4 is pivotally attached to the trigger housing a 5 at trigger shoe pivot pin ⁇ 2 .
- Trigger shoe 4 may be adjusted by a trigger shoe over travel adjusting screw 7 and trigger shoe return spring 18 , a trigger pull adjustment screw 6 and a sear engagement adjustment screw 8 .
- Trigger shoe 4 contacts an engagement point 17 on a rocker arm type sear bar 3 . Sear bar 3 rotates about the trigger housing 5 via a sear bar pivot pin 11 .
- Sear bar 3 is biased on a first pivoting end to a return position by a sear bar return spring 16 partially housed in a threaded passageway in trigger housing 5 and compressed by a trigger pull adjusting screw 9 .
- the second pivoting end of sear bar 3 is in contact with a push rod 2 housed in one of a plurality of push rod passageways (A, B, C & D) formed in said trigger housing 5 .
- the push rod 2 communicates through one of the passageways A–D to contact the underside of the firing pin block bar 1 .
- the lock time of the present invention is adjustable by means of a user placing push rod 2 into one of the plurality of push rod holes A, B, C & D. Since the lock time is defined as the time between the firing shoe 4 initially disengaging sear bar 3 and the firing pin block bar 1 releasing firing pin cocking piece 13 , any reduction in the length of travel of any member of the linkage between trigger shoe 4 and firing pin the block bar 1 will reduce the lock time.
- sear bar 3 When push rod 2 is located in push rod hole A, sear bar 3 must rotate the greatest amount before the firing pin block bar 1 can release firing pin cocking piece 13 . This is due to the geometric relationship of push rod 2 contacting sear bar 3 at a point closest to sear bar pivot pin 11 . As push rod 2 is placed in push rod holes further away from sear bar pivot pin 11 , the amount of rotation of the sear bar 3 is lessened and therefore the lock time is reduced accordingly.
- FIGS. 2A and 2B illustrate the push rod 2 placed in push rod hole B.
- the push rod 2 displaces in a downward direction causing the firing pin block bar 1 to release firing pin cocking piece 13 .
- the amount of rotation of sear bar 3 is lessened since push rod 2 is placed in push rod hole B, further away from sear bar pivot pin 11 .
- FIGS. 3A and 3B illustrate the push rod 2 placed in push rod hole C.
- FIGS. 4A and 4B illustrate the push rod 2 placed in push rod hole D showing the least amount of rotation of sear bar 3 about sear bar pivot pin 11 .
- the lock time for the trigger mechanism is the shortest since sear bar 3 rotates the shortest distance to cause push rod 2 to drop the firing pin block bar 1 and release firing pin cocking piece 13 .
- An additional feature of the invention to adjust the trigger shoe 4 pull force is the inclusion of an adjustable spring mechanism that exerts a return spring force on the sear bar 3 .
- the sear bar 3 has an end opposite sear bar engagement point 17 for receiving sear bar return spring 16 .
- the purpose of sear bar return spring 16 generally is to bias sear bar 3 about sear bar pivot pin 11 into a return position after the rifle action bolt body 14 and firing pin cocking piece 13 of the action has cycled back to a cocked position.
- sear bar return spring 16 Housed within a portion of this threaded passageway is the sear bar return spring 16 abutting the trigger pull adjusting screw 9 on a first end room, and abutting the sear bar 3 on a second end.
- the force exerted by sear bar return spring 16 upon sear bar 3 can be adjusted by moving the trigger pull adjusting screw 9 within the threaded passageway of trigger housing 5 .
- trigger pull adjusting screw 9 may be moved in an upward direction away from the sear bar 3 .
- trigger pull adjusting screw 9 may be moved in a downward direction, into said threaded passageway toward the sear bar 3 .
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Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/296,401 US7188561B1 (en) | 2005-12-08 | 2005-12-08 | Adjustable firearm trigger mechanism and method of adjustment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/296,401 US7188561B1 (en) | 2005-12-08 | 2005-12-08 | Adjustable firearm trigger mechanism and method of adjustment |
Publications (1)
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US7188561B1 true US7188561B1 (en) | 2007-03-13 |
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US11/296,401 Expired - Fee Related US7188561B1 (en) | 2005-12-08 | 2005-12-08 | Adjustable firearm trigger mechanism and method of adjustment |
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Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060207149A1 (en) * | 2005-03-19 | 2006-09-21 | Lazor Ernest R | Adjustable and removable trigger |
US20100024273A1 (en) * | 2008-07-31 | 2010-02-04 | Duperry Peter A | Method and apparatus for trigger assemblies for firearms |
US20100175291A1 (en) * | 2009-01-13 | 2010-07-15 | Farley Jr James Shelton | Kinetic Firearm Trigger |
CN102322769A (en) * | 2011-09-15 | 2012-01-18 | 重庆建设工业(集团)有限责任公司 | Transmitting mechanism |
US8220193B1 (en) | 2010-09-22 | 2012-07-17 | O.F. Mossberg & Sons, Inc. | Method and apparatus for adjustable trigger assemblies for firearms |
US20130267321A1 (en) * | 2011-06-17 | 2013-10-10 | lironburg Inventions Ltd. | Game controller |
US8572880B2 (en) | 2011-01-18 | 2013-11-05 | Terrence Dwight Bender | Firearm trigger group |
DE102012109687B3 (en) * | 2012-10-11 | 2014-02-20 | Blaser Finanzholding Gmbh | Trigger mechanism for rifle, has trip lever pressed by pressure spring against stop, and another lever including latching unit for engagement with counter latching unit, where spring is provided on release devices to-be-attached to lugs |
US20140311006A1 (en) * | 2011-06-08 | 2014-10-23 | Artem Alekseevich Kott | Trigger mechanism |
US9052149B2 (en) | 2012-09-04 | 2015-06-09 | Terrence Dwight Bender | Trigger with adjustable shoe |
US9170063B2 (en) | 2010-05-12 | 2015-10-27 | John M. Krieger | Firearm trigger assembly |
US9175917B2 (en) | 2013-12-03 | 2015-11-03 | Terrence Dwight Bender | Trigger with cam |
WO2016028337A1 (en) * | 2014-08-18 | 2016-02-25 | Tubb George Wyatt | Drop-in adjustable trigger assembly with camming safety linkage |
USD757199S1 (en) | 2014-10-03 | 2016-05-24 | Terrence Dwight Bender | Firearm hammer |
US9389037B2 (en) | 2014-03-04 | 2016-07-12 | George L. Reynolds | Two-stage military type trigger |
USD764004S1 (en) | 2014-10-22 | 2016-08-16 | In Ovation Llc | Firearm trigger |
USD777285S1 (en) | 2015-04-28 | 2017-01-24 | In Ovation Llc | Trigger |
US20170089654A1 (en) * | 2015-09-30 | 2017-03-30 | Smith & Wesson Corp. | Sprung Drop Pendulum |
US20170191776A1 (en) * | 2015-04-17 | 2017-07-06 | Serge Dextraze | Multi-stage trigger mechanism for firearm |
US10006733B2 (en) | 2014-10-22 | 2018-06-26 | In Ovation Llc | Non-fouling trigger |
US10222161B2 (en) | 2016-05-06 | 2019-03-05 | In Ovation Llc | Trigger Assembly |
US20200041222A1 (en) * | 2018-07-31 | 2020-02-06 | Martin Dieter Lobert | Toggle Trigger |
CZ308651B6 (en) * | 2019-12-06 | 2021-01-27 | Česká Zbrojovka A.S. | Trigger resistance adjustment mechanism |
US10976124B2 (en) * | 2018-10-18 | 2021-04-13 | Savage Arms, Inc. | Adjustable force trigger mechanism |
US20210381790A1 (en) * | 2020-06-03 | 2021-12-09 | Surefire Llc | Modular Trigger Mechanism |
US11313636B2 (en) | 2019-09-27 | 2022-04-26 | John A. Roessel | Trigger mechanism for a firearm having a vertical and horizontal rotatable trigger piece and a vertical moving sear |
US11592255B2 (en) | 2020-01-20 | 2023-02-28 | In Ovation Llc | Fire control assembly |
US11927408B2 (en) | 2020-01-20 | 2024-03-12 | In Ovation Llc | Fire control assembly |
USD1024253S1 (en) | 2020-07-03 | 2024-04-23 | In Ovation Llc | Trigger cassette |
Citations (19)
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US3899845A (en) * | 1972-12-15 | 1975-08-19 | Anschuetz Gmbh J G | Recoilless weapon |
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2005
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DE4125148A1 (en) | 1991-07-30 | 1993-02-04 | Gerold Domhan | Trigger mechanism for sporting gun - has roller fitted to end of pawl which retains firing pin to reduce friction |
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US6131324A (en) | 1998-11-30 | 2000-10-17 | Jewell; Arnold W. | Adjustable dual stage trigger assembly |
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Cited By (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060207149A1 (en) * | 2005-03-19 | 2006-09-21 | Lazor Ernest R | Adjustable and removable trigger |
US20100024273A1 (en) * | 2008-07-31 | 2010-02-04 | Duperry Peter A | Method and apparatus for trigger assemblies for firearms |
US8250799B2 (en) | 2008-07-31 | 2012-08-28 | O.F. Mossberg & Sons, Inc. | Method and apparatus for trigger assemblies for firearms |
US20100175291A1 (en) * | 2009-01-13 | 2010-07-15 | Farley Jr James Shelton | Kinetic Firearm Trigger |
US8099895B2 (en) | 2009-01-13 | 2012-01-24 | Farley Jr James Shelton | Kinetic firearm trigger |
US9170063B2 (en) | 2010-05-12 | 2015-10-27 | John M. Krieger | Firearm trigger assembly |
US8220193B1 (en) | 2010-09-22 | 2012-07-17 | O.F. Mossberg & Sons, Inc. | Method and apparatus for adjustable trigger assemblies for firearms |
US8572880B2 (en) | 2011-01-18 | 2013-11-05 | Terrence Dwight Bender | Firearm trigger group |
US20140311006A1 (en) * | 2011-06-08 | 2014-10-23 | Artem Alekseevich Kott | Trigger mechanism |
US20130267320A1 (en) * | 2011-06-17 | 2013-10-10 | Ironburg Inventions Ltd. | Game controller |
US9308450B2 (en) * | 2011-06-17 | 2016-04-12 | Ironburg Inventions Limited | Game controller |
US9707479B2 (en) * | 2011-06-17 | 2017-07-18 | Ironburg Inventions Ltd. | Game controller |
US20130267321A1 (en) * | 2011-06-17 | 2013-10-10 | lironburg Inventions Ltd. | Game controller |
US9308451B2 (en) * | 2011-06-17 | 2016-04-12 | Ironburg Inventions Limited | Game controller |
CN102322769A (en) * | 2011-09-15 | 2012-01-18 | 重庆建设工业(集团)有限责任公司 | Transmitting mechanism |
US9052149B2 (en) | 2012-09-04 | 2015-06-09 | Terrence Dwight Bender | Trigger with adjustable shoe |
DE102012109687B3 (en) * | 2012-10-11 | 2014-02-20 | Blaser Finanzholding Gmbh | Trigger mechanism for rifle, has trip lever pressed by pressure spring against stop, and another lever including latching unit for engagement with counter latching unit, where spring is provided on release devices to-be-attached to lugs |
US9175917B2 (en) | 2013-12-03 | 2015-11-03 | Terrence Dwight Bender | Trigger with cam |
US9696103B2 (en) | 2013-12-03 | 2017-07-04 | In Ovation Llc | Trigger with cam |
US9389037B2 (en) | 2014-03-04 | 2016-07-12 | George L. Reynolds | Two-stage military type trigger |
US10006732B2 (en) | 2014-03-04 | 2018-06-26 | George L. Reynolds | Two-stage military type trigger |
WO2016028337A1 (en) * | 2014-08-18 | 2016-02-25 | Tubb George Wyatt | Drop-in adjustable trigger assembly with camming safety linkage |
USD757199S1 (en) | 2014-10-03 | 2016-05-24 | Terrence Dwight Bender | Firearm hammer |
USD817436S1 (en) | 2014-10-03 | 2018-05-08 | In Ovation, LLC | Firearm hammer |
USD764004S1 (en) | 2014-10-22 | 2016-08-16 | In Ovation Llc | Firearm trigger |
USD835743S1 (en) | 2014-10-22 | 2018-12-11 | In Ovation, LLC | Firearm trigger |
US10006733B2 (en) | 2014-10-22 | 2018-06-26 | In Ovation Llc | Non-fouling trigger |
US10578385B2 (en) * | 2015-04-17 | 2020-03-03 | Cadequip, Inc. | Multi-stage trigger mechanism for firearm |
US20170191776A1 (en) * | 2015-04-17 | 2017-07-06 | Serge Dextraze | Multi-stage trigger mechanism for firearm |
USD777285S1 (en) | 2015-04-28 | 2017-01-24 | In Ovation Llc | Trigger |
US9631886B2 (en) * | 2015-09-30 | 2017-04-25 | Smith & Wesson Corp. | Sprung drop pendulum |
US20170089654A1 (en) * | 2015-09-30 | 2017-03-30 | Smith & Wesson Corp. | Sprung Drop Pendulum |
US10222161B2 (en) | 2016-05-06 | 2019-03-05 | In Ovation Llc | Trigger Assembly |
US20200041222A1 (en) * | 2018-07-31 | 2020-02-06 | Martin Dieter Lobert | Toggle Trigger |
US20210341243A1 (en) * | 2018-10-18 | 2021-11-04 | Savage Arms, Inc. | Adjustable force trigger mechanism |
US10976124B2 (en) * | 2018-10-18 | 2021-04-13 | Savage Arms, Inc. | Adjustable force trigger mechanism |
US11815323B2 (en) * | 2018-10-18 | 2023-11-14 | Savage Arms, Inc. | Adjustable force trigger mechanism |
US11313636B2 (en) | 2019-09-27 | 2022-04-26 | John A. Roessel | Trigger mechanism for a firearm having a vertical and horizontal rotatable trigger piece and a vertical moving sear |
US12044493B2 (en) | 2019-09-27 | 2024-07-23 | John A. Roessel | Trigger mechanism for a firearm having a vertical and horizontal rotatable trigger piece and a vertical moving sear |
CZ308651B6 (en) * | 2019-12-06 | 2021-01-27 | Česká Zbrojovka A.S. | Trigger resistance adjustment mechanism |
US11592255B2 (en) | 2020-01-20 | 2023-02-28 | In Ovation Llc | Fire control assembly |
US11927408B2 (en) | 2020-01-20 | 2024-03-12 | In Ovation Llc | Fire control assembly |
US20210381790A1 (en) * | 2020-06-03 | 2021-12-09 | Surefire Llc | Modular Trigger Mechanism |
US11982503B2 (en) * | 2020-06-03 | 2024-05-14 | Surefire, Llc | Modular trigger mechanism |
USD1024253S1 (en) | 2020-07-03 | 2024-04-23 | In Ovation Llc | Trigger cassette |
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